Messages in this thread Patch in this message | | | From | Tao Guo <> | Subject | [PATCH 2/2] umem: fix up unplugging | Date | Mon, 4 Jun 2012 10:41:51 -0400 |
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In that patch, Jens removed the whole mm_unplug_device() function, which used to be the trigger to make umem start to work.
We need to implement unplugging to make umem start to work, or I/O will never be triggered.
Signed-off-by: Tao Guo <Tao.Guo@emc.com> Cc: Neil Brown <neilb@suse.de> Cc: Jens Axboe <axboe@kernel.dk> Cc: <stable@vger.kernel.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: <stable@vger.kernel.org> --- drivers/block/umem.c | 11 +++++++++++ 1 files changed, 11 insertions(+), 0 deletions(-)
diff --git a/drivers/block/umem.c b/drivers/block/umem.c index aa27120..89cc9a6 100644 --- a/drivers/block/umem.c +++ b/drivers/block/umem.c @@ -513,6 +513,15 @@ static void process_page(unsigned long data) } } +static void mm_unplug(struct blk_plug_cb *cb) +{ + struct cardinfo *card = cb->q->queuedata; + + spin_lock_irq(&card->lock); + activate(card); + spin_unlock_irq(&card->lock); +} + static void mm_make_request(struct request_queue *q, struct bio *bio) { struct cardinfo *card = q->queuedata; @@ -523,6 +532,8 @@ static void mm_make_request(struct request_queue *q, struct bio *bio) *card->biotail = bio; bio->bi_next = NULL; card->biotail = &bio->bi_next; + if (bio->bi_rw & REQ_SYNC || !blk_check_plugged(q, mm_unplug)) + activate(card); spin_unlock_irq(&card->lock); return; -- 1.7.7.6
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